4.11.2025
Autor:
Lenka Václavíková

Invisible Roof Drawings Errors: Catch Them Before They Cost You

On paper, a roof design can look flawless. In reality, construction often reveals hidden mistakes in project plans—mistakes that only become apparent too late: during fabrication, on-site assembly, or installation. Every correction costs money, delays schedules, and adds stress to the team. Why does this happen? And is there a way to prevent it?

Why drawings errors happen

Most designers usually work in 2D environment. When drawing in a flat plane, it’s very difficult to recognize whether the individual surfaces connect correctly, whether valleys and ridges are at the correct heights, and whether it is possible to actually assemble the geometry in space. Mistakes aren’t limited to designer drawings—errors can also appear in aerial surveys or other data sources. At first glance, everything looks perfect, but converting those inputs into 3D often reveals inaccuracies.

Minor deviations are usually not a problem—experienced roofers can fix them on site. The problem arises with fundamental geometric errors. But these errors only become obvious when you start thinking in 3D. And that's when every adjustment becomes expensive.

Figure 1: Original architectural plan

When the truth comes out

Once the individual roof surfaces are modelled in space, all the inaccuracies that remained hidden in the plan become apparent. Such issues are often impossible to notice on a flat surface, but you can see them immediately in space. If errors are not detected and corrected in time you end up improvising on-site—a costly and stressful solution.

HiStruct Roofs spots errors in time

The HiStruct Roofs 3D configurator allows you to instantly check whether the geometry actually makes sense. The model clearly shows where surfaces don’t connect or where ridges are at the wrong height. HiStruct highlights these errors and lets you correct them so that the entire model matches the real-world construction.

Figure 2: A 3D model of the roof based on the original drawing reveals geometry errors. The design does not actually work as it appears on paper. While the roof looks feasible in the drawing, differences in the actual slopes of the surfaces become apparent when modeled in 3D. Rounded or incorrectly entered slopes in the drawing make it impossible to accurately model the common edge of two surfaces.

From an accurate model to accurate implementation

Once the geometry is corrected, the model can be used to calculate required materials, export drawings, and generate other necessary data. All reports in HiStruct Roofs automatically update with any changes, ready for download at any time. The result is an accurate model with precise drawings, simplifying project preparation and eliminating errors before you even get on the roof.

Figure 3: Geometry ready to be fixed. In HiStruct Roofs, you can not only detect errors, but also easily repair the geometry. You set the correct slope of each surface and mark the places where they should intersect so that they can share a common edge. The tool then automatically connects the surfaces and determines their common lines, so that the roof can be remodeled correctly. For simpler errors, the repair is done automaticaly and no additional drawing is necessary. The configurator can identify and eliminate the problem on its own.

The sooner you detect an error, the less it costs

HiStruct Roofs allows you to find and fix mistakes before ordering materials or starting installation. That’s the difference between predictable project execution and costly surprises on-site.

Figure 4: Corrected geometry and resulting 3D model

We’d be happy to show you how HiStruct Roofs detects and fixes errors before they turn into costly problems. Book a short demo and gain confidence in every project.

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